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  • Displaying a PNG image
  • Transparent image in PNG format
WINDEV
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WEBDEV
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Stored procedures
Saves an image:
  • in a file in PNG format.
  • in memory.
This image corresponds to the image contained in one of the following elements:
  • in an Image control.
  • Versions 17 and later
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    New in version 17
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    in an Image variable.
  • in a Bar Code control.
    Linux The Bar Code controls are not available in this version. Therefore, no image found in a Bar Code control can be saved.
  • in a Web Camera field.
Remarks:
  • Only the visible part of the Image control is saved.
  • The border of the Image control (if it exists) is also saved.
    Reminder: The border of the Image control is defined in the "Style" tab of the description window of control.
  • This function can only be used to save the images for screen resolutions up to 32 bits.
  • This function cannot be used with the Image controls found in the reports.
Versions 15 and later
Linux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
New in version 15
Linux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Linux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Versions 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
// Saves the image found in "IMG_ImageDrawing" in "C:\Documents\Image.PNG"
ResSave = dSaveImagePNG(IMG_ImageDrawing, "C:\Documents\Image.PNG")
// Saves in memory the image found in "IMG_ImageDrawing"
ResSave = dSaveImagePNG(IMG_ImageDrawing, inMemory)
Syntax
WINDEVUniversal Windows 10 AppJavaUser code (UMC)

Saving an image in a file in PNG format Hide the details

<Result> = dSaveImagePNG(<Image name> , <File name> [, <Transparency color>])
<Result>: Boolean
  • True if the image was saved,
  • False otherwise. To find out the error details, use ErrorInfo associated with the errMessage constant.
<Image name>: Character string (with or without quotes) or Image variable
  • Name of Image control, Bar Code control or Web Camera control to save. The Image controls found in a report cannot be used.
  • Java Name of Image control to use.
  • Versions 17 and later
    WINDEVWindowsLinuxUser code (UMC) Name of the variable of type Image to handle.
    New in version 17
    WINDEVWindowsLinuxUser code (UMC) Name of the variable of type Image to handle.
    WINDEVWindowsLinuxUser code (UMC) Name of the variable of type Image to handle.
    Name of the Image variable to use.
<File name>: Character string (with quotes)
Name and full (or relative) path of PNG file. A UNC path can be used. The file extension is optional.
Caution:
  • The destination directory must exist in order for the image to be saved.
  • The existence of the PNG file is not checked. This file is automatically overwritten if it already exists.
<Transparency color>: Optional integer
Color that will be considered as being transparent in the image. This color can correspond to:If this parameter is not specified, the generated image is not transparent.
Universal Windows 10 App Syntax not available

Saving an image in memory Hide the details

<Result> = dSaveImagePNG(<Image name> , <inMemory> [, <Transparency color>])
<Result>: Buffer
Byte string containing the image in PNG format.
This byte string can then be assigned to a Image control, saved in a file (fSaveText function), sent through a network (thanks to Socket functions), ...
<Image name>: Character string (with or without quotes) or Image variable
  • Name of Image control, Bar Code control or Web Camera control to use. The Image controls found in a report cannot be used.
  • Java Name of Image control to use.
  • Versions 17 and later
    WINDEVWindowsLinuxUser code (UMC) Name of the variable of type Image to handle.
    New in version 17
    WINDEVWindowsLinuxUser code (UMC) Name of the variable of type Image to handle.
    WINDEVWindowsLinuxUser code (UMC) Name of the variable of type Image to handle.
    Name of the variable of type Image to handle.
<inMemory>: Constant
inMemory: Constant used to save an image in memory.
<Transparency color>: Optional integer
Color that will be considered as being transparent in the image. This color can correspond to:If this parameter is not specified, the generated image is not transparent.
Remarks

Displaying a PNG image

Caution: If the image in PNG format is semi-transparent, the display of the image is slower.

Transparent image in PNG format

To save a transparent image in PNG format, the Image control must be filled with the transparent color beforehand.
Example used to draw a transparent line and to save it in PNG format:
dStartDrawing(IMG_Image1, dWithOpacity)
dChangeMode(drawDefault)
FOR nI = 0 _TO_ IMG_Image1..Width
FOR nJ = 0 _TO_ IMG_Image1..Height
 dPoint(nI, nJ, RGB(255,255,255), 0)
END
END
dPen(RGB(100, 020, 200), 0,10, 100)
dLine(10, 10, 100, 10)
dSaveImagePNG(IMG_Image1, CompleteDir(fExeDir()) + "img.png")
Component : wd250pnt.dll
Minimum version required
  • Version 9
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